Plant for producing paper-pulp and freeing it from liquid.



H. STRIETH.

PLANT FOR PRODUCING PAPER PULP AND PREEING IT I'RDM LIQUID. *Ammou'lonrILnn JULY 27, 1911.

L,03,445. Patelited Apr.16, 1912.

JiioW Ute in'r risn sratrns PATENT oFFIoE;

ZEIEINRIVGHYSTRIETH, or NUREMBE RG, GERMANY.

PLAnr roe Paoniicme rarnnrunr Aim rename IT FROM mourn,

messes,

Z?) all whom it may concern 1 i v Belt lmown that I, HEINRICH STmn'n-I,

:1 mt ,cn of the Empire of Germany, residing at Nuremberg, in the Empireof'Germany. hare invented a' new and useful Plant tor ProducingPaper-Pnlp and Free ing ltlrom Liquid, ofwhich the following is a speilicati'on.

My inrention consists of a new plant car pable of producing paper pulpfrom printedor written papers, old pasteboards and other old rawmaterials or from new raw millhoard, and the like are to be replaced] hyapparatus contained in the new plant.

The-new plant com rises an apparatus for renewing the raw-,materlalstogether with a lye vand additional chemicals, fur-' ther for, cuttingup the raw materials and. subjecting them to the action of the lye byagitation, a receptacle for receiving from this apparatus the stuff andallowing the lye to further actnpon the materials,-

a press for separating the lye, pure or impure, "from the] paper pulpand discharging the pulp freed from liquid for -fnrther treatment,-asecond'apparatus for mixing the impure lye with chemicals adapted toprecipitate the impurities, filters for sepa rating the purified lyefrom the precipitate, and means for passing the stuff fromthereceptacleto the. press, the liquid separated from the press to'thesecond apparat-us,'the liquid mined with chemicals from the secatiis tothe filters and the purified i tilt rs to the first apparatus. is soarranged, that no. lye is that, nothine; of the stuff gets l. will nowproceed to "'"rihe no; invention with reference to tin accmopanyingdrawing, .which diagrammatically represents a plant, the first andsecond-apparatus and the filters being shown in a vertical section andthe other apparatus in an elevation.

1 denotes the first apparatus, which is shown to consist of a verticalcylindrical Specification 01. Letters Patent.

'65 similar to thebla'des of a screw-propel- Patented Apr. 16, 1 912.

Application file'd July 27, 1911. Serial No. 640,741.

some floor or stage -19, and of a cuttingup, mixing and agitating gearwithin the vessel 50. On the top of the vessel :1 frame is disposed.which is hown to consist or several inclined. tubes 51 and a headpiece52 connecting them. A ventral shaft 53 mounted to turn in the head-piece52 above and in a footstcp-hcarinn W3 below and has fastened on it ahero] wheel ST and two crossheads or stars ("2 and ca. A driving shaft54 is mounted in thrhead-piece. SZ'to turn and carries last and loosepulleys 55, for driving hy means of a bevel wheel.

56 the already 'niontir'anml hovel wheel 57 with the central haftiiiland by means of a. smaller bevel wheel 56 another herel 7}) wheel 59loose on 'lhc central haft Th I bevel wheel 59 is rigidly connected llarge gear wheel 0 upported by ih'e p eicrosshead or stand F everal(here-two) j Vertical shafts (ll. 1 are molinlodlto,t-1ii'n in the freeends of the crofslwnds or" stars (32 and (53 and have taste-nod on their'1 I ends gear wheels (31. l. which mesh the large gear wheel '3 l laelishaft l (35 shown to have fast on it stars}? 2 each comprising severalarms or ltniy' e's, which may be serrated on their edges and, if sopreferred,may have on their iipper'and' lower sides pins or similardevices-for cut ling through the raw materials. Several Vet licalserrated ribs 89, 89 dist-ribl-itedovert me I periphery are fastened tothe insideiof the' vessel 50. These ribs 89, 89 may be inclined to theperiphery of the. vessel so as to permit the materials during their"motion to slide off the ribs, whereby their. mixture, with the lye isfurthered: \Vhere soprefer-red, some of the ribs 89,, 89-inay behingedto the inside of the vessel and-be pressed By means of suitable springsagainst stops, which hold them in their normal position/ Thefootstep-bearings 66 for the lower end of the central shaft 53 is shownto he supported by means of arms 67' at a convenient height above thecentral 1'00 hole i the bottom of the vessel 50, which botto'r fi; isconnected with a slidewalve' of any known construction. "Where so.preferred, some of the knives 2, 2, for erample,v 2 2 may be inclinedto the shaft 64 or ler for the purpose of creating a circulation' of thecontents within the vessel 50.

directionfaiid the shafts} 6 p, t

to rotate in the 'sa e direction,

53 on the one hand and the It willlbe iiliiderstood, tha th gear 3;with; the ate in one 65 with the described sets the central-shaftcrossheadsiorgstars 62, 6 .to

stars 2; ,2" I v I I wher j lb ptferred, the driving gear ma be soarrangedas to drivethe' central sha t its 64, 65 on and the robe tacleu7may be provided with a sampler. 0 an 'knowncons'truction (not shown),also wit a. pressure' gag'e, a'waterglass and adevice" (for, exampleacook or a valve) from the bottom 71. Thfthr l'ast named arts are notshown, asthey maybefoi any own construct-ion. 1 12 denotes a ress of anyknown construction capable, of squeezing the'i-liquid out of the paperpulp. This press may comprise a cylinder 90, one cover of which ismovable and is connected-with machineparts, sio that it can beperiodically pressed against the cylinder and again moved-away from thesame. Adistributing valve disposed abovethe cylinder 90 and operatedfrom the driv- Jing gear is connected by means of a tube 5 eitreme'position and to press the stuff a e with the above mentioned tube and isadapted to periodically admit stufl from the receptacle 7 to thecylinder and td. shut in the cy inder 90 is so operated. from thedriving gear as to periodically stop in either oil" the supply. A pistonreciprocating withmitted to the cylinder 90 against the movab cover forsqueezing all liquid out-of the pulp.

'Both the piston and the movable cover are on the inside provided with aperforated disk lined with filtercloth or the like, a thin space beingleft between the sieve and the .piston or cover, and alsowith'atubelead. from this space through the piston or cover to without.When'thepaper pulp in the cylinder 90 between the piston and the movablecoverisbeing pressed for squeezout the liquid, the said distributing mvalve is closed by means of the said maclfineparts. After this pressingthe cover is moved away from the cylinder and the piston'is movedoutward until it-flushes with the edge of the cylinder, 'so that thepressed pulp can drop oil the piston. A rocking stripper 91 ispreferably provided, which is ctions. The

essel 7. Anair-valve 6- inay be disposedmn the top 69 for discharging;any preeipitate adapted to engage between the piston in its. osition andthe movable.

outer extreme v cover and is periodically operated from the driving gearfor stripping the pressed pulp oif'the piston, should, it not alreadyhave dr0pped. l

13 is a tube adapted to'collect, the liquid squeezed out of the: paperpplp and flowing u es oil through the said two 1; -l tdenotesa chute'fibr receiving the paper,

pulp freed from and delivering it up toan'endless belt"15,;, whichcarries the pulp to some machine for 'fur'ther treatment. The

belt-1.3 may also form' a part of a paper mak ingf machine or of -amillbeard-machiue w the like. \Yhere so preferred, the chute may bereplaced 'by an inclined endless apron. e

48 denotes the second apparatus, which is shown to be contained with thefilters in a closed cylindrical ',vessel 19. This vessel is supported bysuitable feet 77, 77 and is divided by apartition 29 into the saidsecond apparatus e18 above and a lower portion, which-latter'in turn isdivided by three :.'slightly inclined partitions 28,'27, 26 into fourfilter chambers 21, 22, 23, 94. \Vhere so preferred, the planepartitions 28, 27,- 26 'may'be shallow calottes. 1 Perforated falsebottoms or; sieves,3(), 31, 32, 33 divideeach oft-he four; filterchambers 21,22, 23, 24 into two spaces'and are covered with any suitablefiltrating material of such athickness, that v a space is still leftbetween the up er surface of the filter and the bottom oi the nexthigher compartment. These spaces above the filters are connected bymeans of branches 37, 38, 39, 40 with a verticalmain tube 36, While thespaces beneath the filters .are connected by means of branches 43, 44,

45, 46 with another vertical main tube 78. A tube 42 connects-the vessel50 of the first apparatus 1 with a stop valve 47 placed on a connection34, which communicates with the second apparatus 48 at a point justabove its bottom 29. A slide-valve 35' is in-' serted between theconnection 34 and the upper end of the main tube 36. Thelowerend of themain tube 36 can be connected with the discharging tube 79 anddisconnected therefrom by means of'a stop'va'lve 80. The upper end ofthe other main tube I 78 can be connected with the tube. 42 by meansof'a branchtube 42 and disconnected therefrom by means of a st op valve41. The

lower end of the main tube 78 can be connected with at-ube 81 leadingto, some source I of Water and" disconnected therefrom by means of astopvalve 82. flhetop Til-of the vessel-19 is connectedwith the alreadyinentlonedtube 13'anda stop valve 16 inserted in the tul e 13 serves forshutting- 0d the sup ply of squeezed-out liquid ffrom the secondapparatus 48. The second apparatus 8 may be provided with a pressurewziterglass and a sampler of any known construction, also a chargingvalve, all of which are not shown.- I

Within. the second apparatus lS a central 5 shaft QG'is mounted to turnin a suitable footstep-bearing' 83 below and a bearing 84 in the topv72rThe central shaft is shown I to discharge it info a closed reservoir 10through a tube 73 in the direction of the ar- 3 2o row. Where sopreferred, filtersand other airipurifyingdevices of any knownconstruction may be inserted in-the tube 7 8 between the compressor 11and the reservoir 10 torthe purpose of obtaining pure comzo'pressedair.A pressure gage 76 on the top 7'4 of the reservoir 10 serves forindicating a the pressure of the compressed air. The

'reservo i lo may be supported by suitable feet 75, 7'5", as shown. itisshown to be connectedjwith the top 69 of the receptacle 7 by means of atube 9 and with the top 72 of the second spparatus 48 by means of atube.

Q18; while sto .valves 8 andll are respecmay inserts in the two tubes 9and 18.-

"The plant'is' operated as follows: Theressel f the first apparatu's'lis filled with alye, 'iitahleior the respective raw paper material. Thelye may contain besides water soda with or "Without addition of borax,soap'and an; emulsion 'ot chlorhydric acid or other emulsive solvents.(lr-the lye may he simply a mixture of several of these substances, inaybe required. Another useful. lye maybe made fron1;cau'stic soda'andantit'ormin th or without addition of henzin soaps m" ar combinations.Raw ma- ,terials, sdcl printed orf writtcn papers,

old paste-hoards other old raw matcria s v or collulosefgrouinl"woodfaud similar new i convenient quantities chargual into the l 50,while the shafts 53, (14,65 withthe stars 2, i2 arein motion. The knivesof the stars 2. with either raw materials" ai smooth or serrated uges'and with or with;v

-' out pins or other projections will gradually cut up the raw.materials and subject them by. agitation in tho :u-liou' ol' iho lyc.until a uniform pulp is Formed. Already during this operation of thefirst apparatus 1 one part of the impurities, that is thespecificallylighter impurities, will separate and pass into the Foam or 't'rotlronthe level foi' the liquid. ,Bv slciuunin'g off the floating :Eoam

or froth the said part of the impurities is removed From lheoontcntsWhena uni- 6 on the closed receptacle 7 is opened and the contents from thevessel 50 of the first rece t-acle 7. en the first apparatus 1 hascenemptied, the slide-valve 3' is again closed and the vessel, 50'isfrshly. charged. Of eoursethe air-va1ve 6 is again closed and t-hepulp'is left-alonein the receptacle 7 so that the chemitzalseare giventime to comthe specifically; heavier impurities will-pre cipitate,sothat-they can be'dischargcd from devices. lAfter a period equal tothatrequired for the operation of the first apparatus l the actionof-the chemicalsnpon the, pulp will have been completed; :1 lfnece'ssary-,'tl'1is may be ascertained by 'ineans:of

air from the reservoir 10 throught-lle tube 9 to the receptacle 7. Thench pressed air acting upon the level of the anedap will gradually forcethe latter upward through the tubes and 5 inthe direction press 12,where the pulp is successively sepathe chute 14 to the endless belt 15,which carries the pulp freed from liquid to the reofi' through the saidtwo tubes into the colto the second apparatus .1.8, the stop valve 16having been meanwhile opened. The seeliquid, while the receptacle 7 isgradually emptied, the-stop valve 47 and the slide valve-35 being-keptclosed. At thismomcnt the stop valve 16 is closed and'thefirst apparatus1' will have completed its operation, "so that both the air-valve (i andthe slidevalve 3 can he opened for emptying the concept-acle 7as'hc'forc. The liquid admitted tion' to the-part of chemicals not usedvari- -constitucnts, and the like. in order to sepa rate the impuritiessuitable chemicals capable of wirccipitating them are introduced intothe second apl'iarai'us 48 through the said charging valve; after whichthe d riving' gear 88, S7, 86, S5. 20 is startedi, SO illfli the arms8.4 rotating over the hoiloni i-ilwill thoroughly mix tho'chemicals withthe liquid and enable them to properly art upon the that thenhemicals inthe receptacle 7 have completed their action upon the pulp .the

second apparatus 48 will also have com-.

I. pleted its operation, so that its agitator can apparatus throllfi thetube/i into the closed the bottom 7l 1through the said discharging thesaid sampler. At'thisfmoment thefstop valve 8 is opened for admittingcompressedof the arrow into the cylinder 90 of the rated from the liquidand is discharged over 9 tents from the first apparalus,l to the reimpurities-by pi'ecipiiat'ion.- By the time form pulp has'been for'med,the air-valve the slide-va lve 3 isopened for discharging pletetheiract-ionnpon tli'ematerials, while poo spective machine for furthertreatment. The liquid squeezed outof the pulp-flows lec-ting'tube 13,which conducts the liquid end apparatus 48 is gradually filled with theous impurities, such asloos-toncd resins, gluish main tube 36 and thebranches37, 38,39, 40

to the filters above thescreensBO, 31, 32, 33,

the stop valves 41,- 80 and 82 being of course kept closed. Atth sametime the stop valve 17 is opened for admitting compressed air from thereservoir through thetube 18 to the/second apparatus-.48, where thecompressed" air acting upon the level of the liquid will forcethelatterthrough the several filters. Of course these filters willseparatethe precipitate and thus-purify the lye,

which is now Weaker than at the beginning of the operation eta-the firstapparatus.

Khan the first apparatusl has been emptied andj he slide-valve 3'. hasbeen closed, the

stop valve 41 isopened, so that the compressed air will forcethepurified lye from the spaces beneath .the'sieves 30, 31, 32, 33

through the branches Azfi, 4:4, 45, 46, the main tubefiB and the tubes42 42 upward to the vessel. 50 of the apparatus 1; When thefilterchambers are' eni tied and the was- "53 is filled, the stop val theslidesvlave are 5. am

ves 17, 41, 47 and closed. Evidently additions chemicals will require tobe filled into the vessel to compensate for those consumed during theprocess. in, this mannerthephemicals are econo 'mized. as no parto'fthem is wasted and also of the stuif produced niathih' gets lost.- Aslight; quantity of water have to be 7 added in the vessel 50 to,compensate forthe los'sthrough the unavo'ijdfiblemoisture of'th'e pulpcarried. off .by -theendless belt 15.

Obviously; the quantity of the chemicals charged into' the firstapparatus 1, and for this reason the agitatoriof the second apparatusneed not have. so's many arms or be.- so complicated as the agitatorofithe first app'aratus,-the more so,-if the chemicals to be added forthe secondyapparatus- 48 are liquid or easily soluble case-" ,fvvhich ismostly the Iif ase new raw materials, suchas celluploye in the processaudi'l-When the lye separatcdf from the pulp by the press 12endintroduced into the second apparatus 48 is sutiiciently clean, ofcourse the agitator 20,

84 need not be put in motion Then at the" -ervoir 10 to the secondapparatus 48 will force the lye outof this apparatus through the tube 42direct into the first apparatus 1,

While of the various filters no use is made.

From time to time the filters on the sieves ,the reservoir forcompressed paratus to the filters,

- ties, a press 30, 31, 32, 33 require to be cleaned, that is to be.freed from the precipitate deposited on them. This is efi'ected in themanner, thatthe twostop valves and 81 are opened,- so that. pure Waterunder pressure is permit-ted to pass from the respective source throughthe tube 81, the branches 46, 45, 44, 43, the sieves 33, 32-, 31,30 andthe filters and carry off the precipitate through the branches 37 38,39, 40 and the discharging tube 79. After thefilters have been cleanedthe two stop valves 80 and 82 are again closed.

.It'will be seen, thatthe plant describedessentially differs fromthe'ordiuar'y plants used for the production of paper, cardboard,millboard, and the like, and I, haveto remark here, that I reservetomyself the employment of the method carriedinto effect by means ofthis plant in another application-for patentthere for filed b meconcurrentlyhcrewith in the United tates Patent Office. 7

- The'plant described can be varied inmany respects without departingfrom the spirit of my invention. The air-compressor with .air may beomitted, and the pulp may be passed from thereceptacle to the press in'an other known manner. 'The' liquid in the second apparatus may bepermitted to flow by reason of its ownweight from the second apor it maybe passed from the second apparatus to the filters and from thence tothe first apparatus or, from the second apparatus direct to the firstvapparatus in any other known manner.

I claim:

1. In a plant fpr producing paper pulp andjreeing'it from liquid,thecombination with-an apparatus adapted to receive a lye andrawmaterials and comprising an agitator-with rotary kpives for cutting upthe raw. materials st)" as to form '-a.'pulp, of a receptacle, means fordischarging the'contents from said apparatus .into said receptacle, saidreceptacle being adapted to permit the chemicals to" complete theiraction upon the pulp and to precipitate the heavier impuriadapted topress the pulp for squeezing-out the lye, means for passing v the pulpfrom said receptacle to said press,

means for-carrying off from said press the pulp freed from lye, areservoir for the lye separated by saidpress, means for passing the lyefrom said press'to said reservoir,

and means for passing the lye from said reservoir to said apparatus.

2. In a plantfor prc ducing paper pulp and freeing it'from liquid, thecombination with a first apparatusadapted to receive a lye and rawmaterials and comprising an agitator With rotary knives for cutting upthe raw materials so as to form a pulp, of a receptacle, means fordischarging the conj't' i'on up'on;;;the pulp an to;

[heavier-"impurities, t W11 e qu a .x -p insf 'h Pl saidpresa-meanspressito said secou app .r'awlxnaterialswsoas; tdlform a pulp,

fromsai presslthepulp I reservoir daptearp collect the liquid .irom'saidupress, a source of pressedairftubesconnecting the severalderat'ujslinto said-re heir! 'g-adapted to compete their acrecipitatethe spa a tedtopress t the iq'uid', means A 'receptacle to 'n 01? fromsaid 1 1 secpnd epai'ated hy'Tsaid liqui romsaid .us, said secondapparatus c mprising an agitatorjor mixing the lime with" time roe ai'x'nppri: t or? passing the liquid om said second a" paratus to; said'filters, J p "e purified lye from said apparatus, and means forc'l'eanin -said filtersg i I.

Iowa 'plaiitjfor' reducing paper pulp I liquid, the combination with jan apparatus ada' ted to receive a lye and raw .materialsan comprisingan agitatorfjv ith rotary. knives for cutting up ihe" o a eoeptacleadapted to receive the con- 5 rom siidapparatus, to permit the tents'-froi n, said first ceptacle,' said recep permit the chemicals;

apparatus for the lit; p me n f pes ig closedt nt chem calsto-"coxnplete their action upon the i 'iulpandi topreoipitate theheavier impuriies,faipress adapted to press the pulp for squeezinfoutthellye, means for carrying 01f freed from liquid, a separatedcomvices, means for opening said apparatus'and discharging its contentsinto sald closed receptacle; andnieans for opening and clos- Mt sa Laureof rceby- ,ineans U i eemr e ed i he Pu p" the pulp 'compressedlair'soas'to I out of said receptacle to said press andthe liquid out of saidreservoir to said apparatus. a .c

4. In a plant'foi' producing paper pulp and freeing it"it'rofn liquid,the combination with a first apparatus adapted to receive v a lye andraw materials and comprising an agitator with rotary knives for cuttingup the raw materials so as to form 9.3131111), of a closed receptacleadapted to receivethe contents from said first apparatus, to permit thechemicals to complete their action upon purities, a press adaptedtopress thepulp for squeezing. out the liquid, means for car rying offfrom said press the pulp freed from liquid, a second apparatus adaptedto collect the separat (1 liquid irom said,

and to preclpitate the'heavier ins press and provided with an "agitatorfor mixing the liquid with solvents for-its ims purities, filtersadapted to receive the mixturejrorn said second apparatus and to, turn-1t mto. pure lye"tvhile reta nrng the pres, 'o1p1tate,""asource of.compressed air, tubes connecting the several dev1ces,..meahs for openingsaid first apparatus and discharging its contents into saidclosed-receptacle, means for opening and closing said sourcejl ofcompressed means of compressed air the pulp out of said receptacle tosaid press, the liquid out of, said second apparatus to air so as toforce at will '05 "d filters and the paratus or apparatus direct to saidmeans for cleanin 'said filters. V 1

a, IfEINRI ,H STRIETH. "Witnesses: I. a 3

Fm'rz CRAs'rY ELIZABETH HELMUTH.

to force the lyefrom said second first apparatus and 7

